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How to set the reference zone in XY-plot

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Old   November 12, 2011, 08:11
Smile How to set the reference zone in XY-plot
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Tong Zhou
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I have a rotating region in my case. and I want to plot the relative velocity. How to choose the reference zone?
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Old   November 13, 2011, 19:49
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There is one field function for the relative velocity in each reference frame. You can choose it like any other field function.
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Old   November 13, 2011, 21:29
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Hi, thank you for your reply. I'm sorry I am not understand clearly...

actually I defined a line in the domain, then choose plot->XY Plot->relative velocity... but I can not find any option to change the reference frame of this curve.
can you show it one step by step? thank you so much.

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There is one field function for the relative velocity in each reference frame. You can choose it like any other field function.
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Old   November 14, 2011, 18:55
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In the dialog where you define the quantity to display, you can just choose the velocity relative to a reference frame, just like any other field function. Don't look for "relative velocity" but for "velocity". The velocities relative to a reference frame could be found when pointing on the little black arrow.
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Old   November 15, 2011, 04:14
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Thank you so much......

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Originally Posted by abdul099 View Post
In the dialog where you define the quantity to display, you can just choose the velocity relative to a reference frame, just like any other field function. Don't look for "relative velocity" but for "velocity". The velocities relative to a reference frame could be found when pointing on the little black arrow.
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